Protective device



June 24, 1952 H. P. BAUMANN PROTECTIVE DEVICE Filed sept. 11, 1947 INVENToR Harry l? Baumann mac #Wm/w Attorneys ,culflao UNITED STATES PATENT "OFFICE PROTECTIVE DEVICE Harry P. Baumann, Milwaukee, Wis.

Application September 11, 1947, Serial No. 773,390

7 Claims. 1

The present invention relates to protective devices for carbide tipped tools and more particularly to a protector for a carbide tipped cutting tool such as a circular saw or the like.

Carbide tipped tools, particularly saw blades and circular saws having a multiplicity of carbide tipped teeth are easily subject to damage in packing, shipping, storage and even in mounting and removing them for resharpening due to the brittleness of the carbide tips which may be broken or knocked oli merely by striking the tipped teeth against the edge or surface of any solid substance such as Wood, metal or the like. Since such tools often cost from one hundred and fty to several hundred dollars and in many instances are refused by a purchaser because of damage apparent upon unpacking the tool or after it is mounted for use, a suitable protector for shipment and handling of the tool in mounting it in operative position is extremely desirable from the standpoint oi the manufacturer. Furthermore, since the operation of mounting the tool and removing and remounting the tool for resharpening is the responsibility of the purchaser or user, a suitable protector to prevent damageV under these latter circumstances is also desired by purchasers and users of such tools.

Accordingly the primary object of the present invention resides in the provision of a protective device capable of guarding a carbide tool against damage by striking against a solid substance.

Another important object of the present invention resides in the provision of a protective device that not only protects the tool during packing, shipping and unpacking of the tool but will also protect the tool while it is being assembled in place for use, removed and transported for sharpening and stored between periods ci use.

Another object of this invention resides in providing a carbide tool protective device which is itself `rigid but provides an internal cushion to absorb any relative movement between the tool and the protective device.

Still another object of the present invention resides in the provision of a separable protector which may be readily assembled with respect to a tool, particularly when the tool is in place for use.

Another object of this invention is to provide a separable carbide tool protective device with positive holding but readily and easily removable se curing means.

Still other objects will appear from the following description and appended claims when read in conjunction with the attached drawing wheres 1n:

Figure 1 is a plan view of a protective device constructed in accordance with the present invention and applied to a circular saw blade;

Figure 2 is a transverse sectional view taken on line 2--2 of Figure 1;

Figure 3 is a fragmental plan view of a modined form of the present invention; and

Figure 4 is a fragmental end View of Figure 3 as seen from the left of Figure 3.

With continued reference to the drawing wherein like reference numerals are employed to indicate the same elements throughout the several iigures, the present invention is illustrated in connection with a circular saw blade. The invention is of particular importance with such blades because of their greater weight, the diiculty of packaging them for shipment and the greater likelihood of injury when mounting the blade on its arbor under the work supporting table and in the saw receiving slot.

As shown in Figures 1 and 2, the protective device IIJ comprises a pair of mating semicircular sections I I providing a central annular opening I2 exposing the central body portion I3 of blade I4. As clearly seen in Figures 1 and 2, the arbor receiving opening of blade I4 is fully exposed while the carbide tipped teeth I6 and a substantial portion of the blade inwardly of teeth I6 is covered on both sides by the protective covering of the semicircular segments or side members I'I of the protective device I0. As a consequence, the blade may be readily mounted completely on its arbor without interference from the protective device since the arbor opening 20 and the surrounding saw body against which the customary stiffening collars, mounting inserts and the like rest is wholly exposed.

The side members or segments I1 throughout a substantial area of their adjacent Aouter marginal edges contact the opposite faces of a semicircular ring segment I3 which is permanently secured to members I I by any suitable means such as cement, fusion contact or the like. The adjacent ends of semicircular members I1 and semicircular ring segments I8 abut one another along the lines I9 and 2l. The inner peripheral edges 22 of semicircular ring segments I8 preferably closely engage the tips of teeth I6 as clearly seen in Figure 1 to prevent relative transverse movement between the protective device I0 and blade I4 and the thickness of ring segments I8 is preferably equal to or only slightly greater than the thickness of blade I4 so that blade I4 wh be snugly held within the protective device While any suitable means may be employed to retain sections II in assembled relation, the preferred embodiment of the invention disclosed in Figures 1 and 2 contemplates the use of. spring clips 23 preferably formed of spring steel. To this end, each of members I1 adjacent their abutting ends are provided with circular aper-l tures 24, the apertures in each of the super posed members h1 1being axially aligned.V Clips 23 as clearly seen 'in Figure 2 are substantially U-shaped, and the connecting bridges 25 are substantially longer than the overall thickness of the sections Il and interposed ring I3. The opposed legs 26 of clips 23 converge toward each other from their juncture with bridge 2.5 to their free ends which normally are spaced from each other a distance substantially less than Jthe thickness of section I I and are provided with semispherical protuberances 21 adapted to 'iit within apertures 24 as shown in Figure 2. Since legs 26 converge toward their free lends vand are formed of spring steel, considerable lpressure is exerted on 'members I1 and, due lto the semispherical shape of depressions `21 cooperating with apertures 2A, the ends of members 21 are tightly drawn into abutting `relation. vT-he gripping effect of clips f23 'isiin'fact'iso strong that a screw driver or some similar tool is required to remove the clips. As a Vconsequence accidental displacement of clips 23 is highly improbable and relative light wrapping Ypaper -or the like may readily lbe employed `in shipping with anin cident saving in packingcosts.

While any suitablematerial may be 4used in 7:the

production of members I1, lit is preferable to utilize a 4suitable 4transparent; m'ateria1 so the condition of the carbide tips and the type of tooth may be vreadily Idetermined withou-t -removal of the protective device. This is particularly desirable where the protective device is used for protection Yduring lstorage Vand several blades having ldifferent vtooth formations for different types of work are vprovided in a shop lor tool room.Y A suitable material for members 'I1 which has been vsuccessfully used is the transpar ent vplastic obtainable on the open market under .the name Lucite This plastic like many other similar plastics which might be used are particularly suitable ldue to Vthe 4facility* with which they may be molded l"to the desired shape and the non-brealrable characteristics.

While ring IS may also be formed -of Lucite 0r a like plastic, since 'such materials 'are 'suiiciently soft to provide slight penetration of teeth It without damaging them and because such rings may be integrally molded on one--of the members I1, if desired, it has been found desirable, particularly in large size blades of substantial weight, to form rings t8 of leather, sponge rubber or some such readily Ideformable material.

It will Valso -be appreciated that the protective device of this invention is so designed that the saw blades may be readily stored on pegs ori-the like provided -on a wall of the tool room Sby insertion of the pegs through opening 20.

A'mod-ified form Yof protective -device lila is disclosed in Figures 3 and 4. 'In this form of the present invention, plastic members Illa are substantially identical to members I1 the sole diiferf ence being that the apertures 24 are omitted and rings [8a at one -end are provided with eXtension ytabs 35 and the opposite ends stop -short `of the abutting Iends of members l1a to kprovide a pocket 35 (Figure 4) to receive tabs 35. In this l form of the Invention, clips 23 are replaced by a securing wire 31 which is threaded through aligned openings 38 formed in tabs 35 and the overlapping portions of members I1a. Securing wires 31 are secured in place by twisting their ends together as shown at 39 and, if desired, may have a seal 40 placed at their ends by an inspector at the manufacturing plant to certify to the vproper V.conditions of the `blade .at the time of shipment. In lieu of tabs 35, lpockets 35 and openings 38, the marginal edge of sections Ila vadjacent their abutting ends may be provided with through openings to receive securing wire 1.3.1 :or other fastening element forming a part oi Aan inspection seal.

"The invention may be embodied in other spe- -ciiic :forms without :departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of `the invention being indicated by the vappended claims rather than by theforeging .de- -scription, and all l'changes which come within the meaning and range of equivalency of the claims are therefore intended to `be embraced therein.

What *is claimed and desired to be secured by United States Letters Patent is:

1. A protective casing .for a circular saw blade comprising 'two pairs fof rigid `semicircular members, two members `of each .pair being disposed in overlying relation and `formed to cover the opposite faces of the saw teeth and an adjacent portion of the saw body, spacing-ring segments dis-V posed between-said pairs of overlying semicircular members along their outermargina'l yopposed faces andV adapted to lightly engage the Vperipheral tips of the'teeth of an encased 'saw blade, and means adjacent fthe fends 'of :each of .said semicircular members to -hold them iin assembled relationship.

2. Thecombina'tion dened in claim l wherein said rspacing :ri-ng segments at one end are provided With a ltab extending beyond the adjacent ends of vsaidrsemicircular members and at theV opposite yend stops short of the adjacent ends of said semicircular members to provide a pocket to receive the adjacent tab of a mating casing.

3. |I'he combination defined in claim 2 wherein said tab is provided with a through opening and the ysemicircular members -at their ends remote from saidtab are provided with aligned through openings, said openings being provided to receive a securing wire Ito fasten a pair of mating casings together and form a `circular protective casing.

4. A protective and shipping casing for a cirlcular :saw blade, comprising 'a pair of mating semicircular vcasing sections adapted to be secured together with their ends in abutting relation, each lcasing section comprising a central semicircular ring segment of deformable material and outer semicircular ring seg-ments on either side of the central segment, all of the segments in each section being rigidly secured together and the inner diameter of the central segment being larger 'than the inner diameters of the outer segments, whereby the pair of casing sections when assembled in abutting relationship provide an inner annular groove for the reception of the toothed periphery of a saw blade; means adjacent the abutting ends of the casings to receive a securing element; and a securing element `cooperating with said last mentioned means to secure said vcasing sections together.

5. The combination defined in claim 4 wherein the abutting ends of said semicircular casing sections are respectively provided with a tab extending beyond said abutting edges and a pocket to receive said tab and said means to receive a portion of a securing element comprises aligned openings in said tab and the portions of said casing sections defining said pockets adapting said casing sections to receive a securing element in the form of a securing wire.

6. The combination dened in claim 4 Wherein said semicircular casing sections adjacent their abutting ends are respectively provided with through openings and said securing element comprises a U-shaped spring clip having opposed inwardly facing protuberances formed on its legs and adapted to enter the opposite ends of said through openings.

7. A protective casing for a circular saw blade comprising a pair of mating, semicircular, rigid casing sections having inwardly open radially extending semicircular recesses adapted to receive the teeth and at least a portion of the body of one half of the blade; the casing sections having their adjacent ends in abutting relation and having means forming indentations in their outer surfaces near their abutting ends; and means for securing said casing sections together REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date D. 90,245 Haan July 4, 1933 102,923 Disston May 10, 1870 716,785 Taylor Dec. 23, 1902 '757,740 I-Iappe Apr. 19, 1904 925,244 Stevenson June 15, 1909 1,205,246 Mowry Nov. 21, 1916 1,257,541 Sillcocks Feb. 21, 1918 2,291,219 Fontecilla July 2:8, 1942 2,344,919 Kelly Mar. 21, 1944 

